This book is a compilation of selected papers from the 15th International Workshop of Advanced Manufacturing and Automation (IWAMA 2025), held in China on 13–14, October 2025. Topics focusing on novel techniques for manufacturing and automation in Industry 4.0 are now vital factors for the maintenance and improvement of the economy of a nation and the quality of life. It helps academic researchers and engineering to implement the concept, theory and methods in Industry 4.0 which has been a hot topic. This book makes valuable contributions to academic researchers, engineers in the industry for the challenges in the 4th industry revolution and smart factories.